[Q] Problem to Update MT15i from 431 to 587

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http://forum.xda-developers.com – I've got an MT15i with version 4.1.B.0.431, kernel 2.35.9-perf, rooted, SI 1247-1256 with 58MB free internal memory (though it seens to be wrong, 'cause every time I try to install something it says I don't have enough memory, even though it's only about 5MB) and 1,7GB free SD memory. Recently I received an message from update center telling me I got a new update to install, 4.1.B.0.587, but every time I try to update it I get an error message standing I got an error and I should try later - I tried it using both the phone and my computer - but this generic message is totaly useless. I g (HowTos)